Engine-governor.



No.' 677,855. Patented July 9, 190|.

E. M. CARR.

ENGINE GOVERNOR.

(Appumion 'med Nov. 23, 1900.)

' 2 Sheets-Sheet l.

(N0 Model.)

. /NVEA/T? Emory 772.. Car?) wmvsssss:

No. 677,855. Patented Iuly -9, |90I. E. III .CARR.

ENGINE GUVERNOR.

(Application led Nov. 23, 1900.) (No Model.)

2 Sheets-Sheet 2.

III

.www

W/ TNESSES aww 65 mediately acted upon by the pressure in the UNrTED STATES EMORY M. CARR, OF NEWCASTLE, INDIANA.

ENGINE-GOVERNOR.

sracrrrcacrrolv forming part ef Letters Patent No. 677,855, dated .fury 9, 1901.

Application filed November 23, 1900. Serial No. 37,465. (No model.)

T0 rl/ZZ whom, t Nutr/,conceiva- Be it known that I, EMORY-M. CARR, a citizen of the United States, residing at Newcastle, in the county of Henry and State of Indiana, have inventedv certain new and useful Improvements in Pumping-Engine Governors, of which the followingis a specification.

The object of my said invention is to provide an apparatus by means of which a pumping-engine can be automatically controlled from the pressure in the discharge-pipes of the system, so that a constant water-pressureY in the discharge-pipes or mains can be maintained, and this isaccomplished by varying the point of cut-o in 'the steam cylinder,. thus varying the speed of the engine according to the amount of water consumed by means of my valve mechanism, which includes means whereby it is automaticallycontrolled by the water-pressure in the dischargepipes or mains, as will be hereinafter more particularly described and claimed.

Referring to the accompanying drawings, which are made a part hereof, and on which similar reference characters indicate similar parts, Figure 1 is a side elevation of a portion of a pumping-engine at the steam end provided with governor apparatus embodying my said invention; Fig. 2, a similar view of a portion of the governor apparatus separately; Fig. 3, a detail central sectional view of that portion of said apparatus which is impipes of the system; Fig. 4, a detail top or plan view, on an enlarged scale, of the valve mechanism as seenwhenlooking downwardly from the dotted line 4 4in Fig. 1; and Fig. 5, a detail elevation, on a still further enlarged scale, of one set of the valve-gear.

The engine A is or may be of an ordinary form. That illustrated is of the Corliss type, which is provided with foursemirotary valves, which are mounted'on the valve-stems 1, 2, 3, and 4. Of`these those mounted on the. stems 1 and 2 are for the admission of live steam, and those mounted onV the stems 3 and 4 control the exhaust-steam. All are'operated primarily from a central wrist-plate B through suitable rods b', b2, b3, and b4, running to suitable arms a', a2, a3, and d4 on said valve-stems, the plate itself being operated, as will be readily understood, by a rod C,

running to an eccentric on the engine-shaft and detachably engaged with a Wrist c, prowith, which includes the cams 5 and 6, mounted on the valve-stems'l and 2, connectingrods 7 and 8 leading from the arms of said cams to the opposite ends of two of the arms of a three-armed or T-shaped lever 9, mounted on a pivot-shaft 10, and which is actuated by the pressure in the discharge-pipes of the pumping system, as will be presently described.

The pipe 12 leads from the discharge-pipe of the pumping system to the bottom of a cylinder 13, which is secured to the frame of the engine, as shown. VWithin this cylinder is a piston composed, in the construction shown,

of a head 14, a plate 15, and a cup-leather 16 said plate and said cup-leather being held in place by a nut 17. Surrounding the pistonvrod 18, near the upper end of the cylinder, is

an annular ring 19, and interposed between said ring and the head 14 is a spring 20. The piston-rod 18 passes out through a tubular adj listing-screw 21, which in turn passes down through a screw-threaded perforation in the head 22 of the cylinder 13 and is adapted to be held in adj usted position therein by a locknut 23.v Said piston-rod 18, at a 'pointvabove the cylinder, is connected to the intermediate 'arms of the lever 9 by a link 24, and thus through the connecting-.rods 7 and 8 operates uponthe valve 'mechanism of the engine.

A drip-pipe 25 communicates with the interior of the upper end of the cylinder 13, as best shown in Fig. 3.

In operation the pressure on the piston 14 is regulated as desired by adjusting the tubular screw 21, by means of whichthe spring 2O can be adjusted to resist any predetermined pressure. When the pump is inoperation, the Huid is forced into the pipes of the system, whence it is withdrawn for use. As the capacity of the pump is usuallyin excess of the IOO requirements for consumption, in the absence of some regulating device the pressure in the pipes would become excessive. With my apparatus Whenever there is an excess of pressure in the pipes it acts upon the piston 14 in the cylinder 18, and thence, through the piston-rod 2l and links, levers, and connecting-rods connected therewith, upon the valves of the pumping-engine, shitting the point of cut-off of such valves, and thus reducing the capacity of the engine. the pipes becomes reduced, the spring 2O acting against said pressure will force the piston-rod down, shitting the valves, through said connections, in the other direct-ion and increasing the capacity ot the engine correspondingly.

By means of my apparatus I secure the following results: The water-pressure is maintained equally at all times, as the'speed of the engine is controlled by the pressure in the discharge-pipe. The steam may be admitted to the steam-cylinder at full boiler-pressure, as the cut-ott is controlled by the water-pressure in the discharge-pipe, and after the cut- Oft takes place the steam expands the remainvder of the stroke, thus securing a saving in consumption of steam. By its use the speed of'the engine is controlled by the amount of 4Water consumed and renders the Corliss pumping-engine as suitable for pumping Water direct into mains as it is in the reservoir orstand-pipe system. This apparatus is positive in its action, is simple, requires little or no attention, and involves no danger in case of the Water being shut ott suddenly. As the pressure is governed automatically, there can be no excess of pressure, and consequently no undue strain on the pump or on the mains. This pressure-governor may be operated in the same machine and in connection With a speed-governor, although entirely independent in its operation.

In Fig. l there is illustrated, in addition to the apparatus by means of Which the engine is controlled from the pressure in the mains or discharge-pipes, an ordinary speed-governor, which through a lever on the shaft 10, connecting-rods 5l and 52, and cams 53 and 54, the remainder of the apparatus being the same, the speed of the engine may be controlled. If both the speed-governor and the pressure-governor are used on the same en- ,gine, the speed-governor Will commonly be As the pressure `in As above stated, all the valves receive their motion from the Wrist-plate. The exhaustvalves always travel the same and also the bell-crank levers ct and CL2 and the hooks h' and h2, which are mounted thereon. Rigidly connected to the valve-stems l and 2 are the valve-operating levers 6l and 62. These levers at the extreme outer ends bear blocks 63, which engage with the hooks. From said levers connecting-rods 64 and 65 extend down to dash-pots D. Springs s, rigidly secured to the bell-crank levers ct' a2, operate to force the hooks into engagement with the block 63 on the valve-operating levers 6l and G2. The lever 62 and the upper portion of the rod 65 are broken away and omitted in Fig. l for purposes of clearness of illustration, so as to better show the relation of the cam 6 to the hook a2. Said lever and rod are, however, shown in Figs. 4 and 5, and the position of the cam-point on the cam 6 is shown in Fig. 5 by means of dotted lines, also the position of the cam-point on the cam 54.

The operation of the two Valves is similar, and for convenience I will describe only that illustrated in Fig. 5, which is drawn on a larger scale and where, therefore, the illustration is plainer.

As above stated, the movement of the hook h2 is always the same, it being driven from the Wrist-plate B. The point at which the steam shall be cut oft, therefore, depends upon the point where this hook disengages with the block 63 on the arm 62, and this is controlled by the position of the cam-point on the camlever 6. This, as will be understood from the foregoing description, is controlled through the connecting-rod 8 and lever 9 from the cylinder 13. As the pressure increases in the discharge-pipes of the pumping system the piston in the cylinder 14 will be forced upwardly, compressing the spring 2O and through the rod 1S rocking the T-shaped lever 9, which through the rods 7 and 8 moves the cams 5 and 6 to such position that the hooks hf and 71.2 will strike them more quickly, thus disengaging said hooks from the blocks 63 on the levers 6l and 62 and permitting the dash-pots D to operate to shut the valves and cut oit the steam. As the pressure in the discharge-pipes of the pumping system decreases the reverse operation takes place, and steam is consequently admitted to the cylinders for a longer period with a proportionate increase of pumping power. The pressure is thus governed with great sensitiveness, and changes in the cut-oft of the steam Whenever the pressure varies are made with the utmost promptness.

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is-

l. The combination, in a pumping system, of a pumping-engine provided with a hook mechanism for controlling the valves whereby a variable cut-ott is produced, a cylinder communicating with the discharge-pipes of the pumping system, a piston therein adapted to be operated in one direction by said pressure, a spring adapted to operate said piston in the other direction against the pressure, a T- shaped rocking lever with one arm of which said piston is connected, rods running from the'other arms of said lever to cams by which the hooks of the cut-O mechanism are controlled, and said hooks, said several parts being arranged and operating substantially as set forth.

2. The combination, in a pumping system, of an engine provided With hook mechanism for controlling the cut-off, an ordinary speedgovernor for actuating said hooks, and a pressure-governor operated from the pressure in the discharge-pipes of the pumping system for also operating said hooks; said pressuregovernor embodying a cylinder connected to the discharge-pipes of the system, a piston therein adapted to be operated in one direction by the pressure, a spring adapted to opcrate said piston in the opposite direction against the pressure, a T-shaped lever mounted to rock on a shaft, one arm whereof is connected to the piston-rod of said cylinder, and rods connected to the other arms of said lever and to the cams for operating the hooks of the cut-off mechanism oi" the engines, all substantially as shown and described.

In witness whereof I have hereunto set my hand and seal at Newcastle, Indiana, this 17th day of November, A. D. 1900.

EMQRY M. CARR. 

